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Constituent SiOp A12O3 FeO+MnO MgO CaO* KaoO KoO Constituent SiO2 . A12O3 FeO+MnO Ma-0 CaO* .... Na20 KoO TABLE 4.—Chemical composition of bulk silicates from chemical analyses and of unidentified fractions "residue" in the modal analyses Atarra Silicate fraction Residue 83% of total 2U.85S of total 1*7.5 2.1 16.8 29.8 2.1+ 1.2 0.1 Mabwe Silicate fraction 82. k% of total 1+7-3 2.9 17.2 29. k 2.0 1.1 0.1 50.3 6.U 17. h 21.U 0.0 1+.0 0.5 Khojrwa** Silicate fraction 83$ of total 1+7.5 2.8 16.7 29.9 2.1 1.2 0.1 Silicate fraction 85% of total 1+7-5 2.7 16.9 29.3 1-9 1.2 0.1 Cranganore Mirzapur Residue 16.7$ of total kk.9 2.6 20.7 30.7, 0.0 0.9 0.1 Residue 19-9/5 of total U8.2 10.0 15.8 21.1 0.0 h.k 0.5 Silicate fraction 82. k% of total 1+6.8 2.7 17.1 30.2 1.8 1.1 0.1 Silicate fraction 82$ of total i+7.3 2.8 17.3 29.5 1.9 1.2 0.2 Karkh Segowlie Residue 19-9$ of total 1+2.2 12.5 16.0 23.6 0.0 5.1 0.6 Residue 20.1J? of total 51.1 6.7 16.6 22.1+ 0.0 2.6 0.5 Silicate fraction 82$ of total 1+6.8 2.5 18.5 28.5 2.2 1.3 0.2 Silicate fraction 81+. 5% of total Kuttippuram Sultanpur *The zero value for calcium in the "residue" is artificial (calculated) because of uncertainties in the amount and composition of Pyroxene 2, Table 2. **Residue not determined (see text). ^&S^ *v -v ;?• . W:S FIGURE 8.—Photomicrograph of thin section of chondritic part of the Segowlie chondrite (cf., Figure 7). Note the patchy variation in grain size. Length of section, 3.6 mm. 1+6.9 2.1+ 19.1 28.5 1.9 1.1 0.1 TABLE 4.—Silicate composition of eight L- and four H-group chondrites Constituent AI2O3 FeO MgO CaO Na2O K2O 8 L-Group Min. Average Max. 46.8 2.1 16.7 28.5 1.8 1.1 0.1 47.2 2.6 17.5 29.4 2.0 1.2 0.1 47.5 2.9 19.1 30.2 2.4 1.3 0.2 *Data fran Fredriksson, et al., 1975 4 H-Group* Min. Average Max. 47.8 2.4 12.7 30.4 2.2 1.1 0.1 48.7 2.9 13.7 31.0 2.5 1.2 0.1 49.2 3.2 15.4 31.5 tions, e.g., loss of volatiles, and extensive melting and drop (chondrule) formation because of low density and high compressibility of the target material. Later impacts on a parent body caused more brecciation, destruction of preexisting chondrules and chondrites, and "solid state" recrystallization rather than melting and formation of liquid droplets, i.e., new chondrules, although this must also have occurred as it did on the moon. 2.7 1.2 0.2 Residue 12.6JS of total 22.6 2.6 51.3 11+.6 fc.7 3.3 0.9 Residue 19.1$ of total 1+3.8 M 2k.k 21+.7 0.0 1.9 0.3
82 Literature Cited Bostrom, K., and K. Fredriksson 1966. Surface Conditions of the Orgueil Meteorite Parent Body as Indicated by Mineral Associations. Smithsonian Miscellaneous Collections, 151(3): 1-39. Cotter, G. de P. 1912. Notes on Indian Aerolites Recorded since 1906. Records of the Geological Survey of India, 42:265- 277. Coulson, A. L. 1940. Catalogue of Indian Meteorites. Memoirs, Geological Survey of India, 75:1-346. Femor, L. L. 1907. Notes on Some Indian Aerolites. Records of the Geological Survey of India, 35:90-02. Fredriksson, K., P. DeCarli, R. O. Pepin, J. H. Reynolds, and G. Turner 1964. Shock Emplaced Argon in a Stony Meteorite. Journal of Geophysical Research, 69:1403-1411. Fredriksson, K., A. Dube, E. Jarosewich, J. Nelen, and A. Noonan 1975. The Pulsora Anomaly: A Case against Metamorphic Equilibration in Chondrites. In George S. Switzer, editor, Mineral Sciences Investigations 1972-1973. Smithsonian Contributions to the Earth Sciences, 14:41-53. Hey, M. H. 1966. Catalogue of Meteorites. 3rd edition, 637 pages. London: British Museum of Natural History. Heymann, D. 1967. On the Origin of Hypersthene Chondrites: Ages and Shock Effects of Black Chondrites. Icarus, 6:189- 221. SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES Hobson, G. V. 1927. Six Recent Indian Aerolites. Records of the Geological Survey of India, 60:128-152. Jarosewich, E. 1966. Chemical Analyses of Ten Stony Meteorites. Geochimica et Cosmochimica Acta, 30:1261-1265. Keil, K., and K. Fredriksson 1964. The Iron, Magnesium, and Calcium Distribution in Coexisting Olivines and Rhombic Pyroxenes of Chondrites. Journal of Geophysical Research, 69:3487-3515. Mason, B. 1963. Olivine Composition in Chondrites. Geochimica et Cosmochimica Acta, 27:1011-1023. 1967. Olivine Composition in Chondrites—A Supplement. Geochimica et Cosmochimica Acta, 31:1100-1103. 1975. List of Meteorites in the National Museum of Natural History, Smithsonian Institution. In George S. Switzer, editor, Mineral Sciences Investigations 1972- 1973. Smithsonian Contributions to the Earth Sciences, 14:71-83. Murthy, M. V. N., S. N. P. Srivastava, and A. Dube 1969. Indian Meteorites. Memoirs, Geological Survey of India, 99:1-192. Silberrad, C. A. 1932. List of Indian Meteorites. Mineralogical Magazine, 23:290-304. Walker, H. 1924. Recent Falls of Aerolites in India. Records of the Geological Survey of India, 55:133-142. Wasson, J. T. 1974. Meteorites. 316 pages. New York: Springer-Verlag.
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SMITHSONIAN CONTRIBUTIONS TO THE EA
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Contents MINERALOGY COMPOSITION OF
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Constituent SiO TiO Al 0 fl 2 3 Cr
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PER CENT CBLCIUM FIGURE 3.—The ca
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Constituent TiO,, 2 2 3 FeO* MnO Mg
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20 Cfl 40 .60 SMITHSONIAN CONTRIBUT
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35'50' I L 6.. 3.. 2.. r FOKT DEFIA
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12 SMITHSONIAN CONTRIBUTIONS TO THE
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14 20 SMITHSONIAN CONTRIBUTIONS TO
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16 Constituent Si0 2 TiO2 A12O3 Cr
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18 20 40 £0 SMITHSONIAN CONTRIBUTI
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20 40 20 SMITHSONIAN CONTRIBUTIONS
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Abyssal Basaltic Glasses as Indicat
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24 Electron-M icroprobe Analysis An
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Page 75 and 76: TABLE 1.—Chemical composition in
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